The CAP 150 lb Dumbbell Set with Rack is made with low-emission cast-iron metal construction, and these durable dumbbells are built for brawn. They have a baked enamel coating that prevents chipping, rust, and dents. Their ten-sided design prevents rolling, and the included A-frame dumbbell rack gives you safe and secure storage. With exercise this effortless, you'll be light years ahead of the gym rats in no time.